Changing a breaker in a hot panel, after tripping

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Call back to an earlier call, where we fixed the heat. This caused breaker to start tripping. 50 amp breaker on #6 Aluminum wire, pulling 42 amps. Couldn’t increase breaker size.
It just tripped again.
Changing
this
breaker
because
it
was
only
pulling
42
amps
and
it's
tripping
a 50
amp
breaker.
The ampacity for this wire isn't but 55 amps,
so I can't increase the size.
I can try changing it and see if maybe this one won't trip.
It's
hot
now.
Placing
one
of
those
wires
because
it
looks
like
it
got
hot.
I'll pull it out and show you in just a second.
Here's the wire I replaced.
See back there the new wire?
